////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2009 Daniel F. Hanson
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
////////////////////////////////////////////////////////////////////////////////

using System.Collections.Generic;

namespace SilverLua.Compiler
{
   internal class UnaryExpressionNode : ExpressionNode
   {
      internal string Operator { get; private set; }
      internal ExpressionNode Operand { get; private set; }
      
      private static Dictionary<string, Opcode> OperatorOpcodes;

      static UnaryExpressionNode()
      {
         OperatorOpcodes = new Dictionary<string, Opcode>();
         OperatorOpcodes.Add("-", Opcode.Negate);
         OperatorOpcodes.Add("#", Opcode.Length);
         OperatorOpcodes.Add("!", Opcode.Not);
      }
      
      internal UnaryExpressionNode(string operatorStr, ExpressionNode operand)
      {
         Operator = operatorStr;
         Operand = operand;
      }

      internal override void EvaluateTo(int register, Parser parser, int currentChunk)
      {
         EvaluateNode operand = Operand.Evaluate(parser, currentChunk);
         
         parser.ChunkList[currentChunk].Add(new Instruction(OperatorOpcodes[Operator],
                                                            new[] { OperandType.Value,
                                                                    operand.OperandType },
                                                            new[] { register,
                                                                    operand.OperandValue }));
      }
   }
}
